🔥 Solar wind
speed: 452.4 km/sec
density: 6.9 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 1255 UT

X-ray Solar Flares
6-hr max: B5 1239 UT Sep13
24-hr: B8 0258 UT Sep13
explanation | more data
Updated: Today at: 1300 UT

🔥 Solar wind
speed: 486.4 km/sec
density: 5.6 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 1744 UT

X-ray Solar Flares
6-hr max: B5 1239 UT Sep13
24-hr: B8 0258 UT Sep13
explanation | more data
Updated: Today at: 1750 UT

SOLAR WIND FROM THE SUN'S NORTH POLE: Earth is inside a minor stream of solar wind leaking from a far-northern hole in the sun's atmosphere. Geomagnetic storms are not expected. Nevertheless, the action of the stream could spark auroras around the Arctic Circle on Sept. 13-14.

Solar wind
speed: 440.6 km/sec
density: 2.1 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 0641 UT

X-ray Solar Flares
6-hr max: B8 0346 UT Sep14
24-hr: B8 0346 UT Sep14
explanation | more data
Updated: Today at: 0645 UT

Solar wind
speed: 437.5 km/sec
density: 4.7 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 0535 UT

X-ray Solar Flares
6-hr max: B4 0115 UT Sep15
24-hr: C1 0649 UT Sep14
explanation | more data
Updated: Today at: 0540 UT

GEOMAGNETIC STORM WATCH: Confidence is growing that a CME might graze Earth's magnetic field on Sept. 17th, possibly sparking minor G1-class geomagnetic storms.

The CME left the sun on Sept. 13th, propelled toward us by an exploding filament of magnetism. Tracking this CME has been tricky, because in coronagraph imagery it overlapped at least two other storm clouds.

Confusion among simultaneous CMEs increased the uncertainty of the forecast.

Solar wind
speed: 317.6 km/sec
density: 7.2 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 0620 UT

X-ray Solar Flares
6-hr max: B1 0226 UT Sep16
24-hr: B2 1415 UT Sep15
explanation | more data
Updated: Today at: 0625 UT

MINOR GEOMAGNETIC STORM WATCH: A CME is approaching Earth for a close encounter on Sept. 17th. It will either miss or deliver a glancing blow. Both outcomes are equally possible given uncertainties in the CME's trajectory. A hit could spark minor G1-class geomagnetic storms and high-latitude auroras.

Solar wind
speed: 333.4 km/sec
density: 7.2 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 1345 UT

X-ray Solar Flares
6-hr max: A1 0000 UT Jan01
24-hr: B2 1415 UT Sep15
explanation | more data
Updated: Today at: 1350 UT

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Solar wind
speed: 393.0 km/sec
density: 6.7 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 0419 UT

X-ray Solar Flares
6-hr max: C3 0420 UT Sep17
24-hr: B1 0226 UT Sep16
explanation | more data
Updated: Today at: 0425 UT

WEAK IMPACT: A CME hit Earth's magnetic field on Sept. 17th at ~0200 UT. The impact was very weak, lifting the solar wind speed by a measly 40 km/s. There's still a chance for geomagnetic unrest, however, as Earth passes through the CME's turbulent and magnetized wake.

Solar wind
speed: 405.0 km/sec
density: 18.2 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 2154 UT

X-ray Solar Flares
6-hr max: A8 1148 UT Sep16
24-hr: C3 0420 UT Sep17
explanation | more data
Updated: Today at: 2200 UT

Solar wind
speed: 381.9 km/sec
density: 10.9 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 0909 UT

X-ray Solar Flares
6-hr max: A8 1148 UT Sep16
24-hr: B1 0226 UT Sep16
explanation | more data
Updated: Today at: 0915 UT

GEOMAGNETIC STORM WATCH: Earth's magnetic field remains unsettled following the impact of a CME on Sept. 17th.

NOAA forecasters say there is a chance of G2-class geomagnetic storms on Sept. 18th as Earth passes through the CME's wake.

Solar wind
speed: 375.4 km/sec
density: 11.4 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 1556 UT

X-ray Solar Flares
6-hr max: A8 1148 UT Sep16
24-hr: B1 0226 UT Sep16
explanation | more data
Updated: Today at: 1605 UT

SUBSIDING GEOMAGNETIC ACTIVITY: The storm is over. Earth's magnetic field is quieting on Sept. 18th following G1-class storm conditions in the wake of yesterday's CME (see below). Bright auroras will probably retreat to the Arctic Circle as the storm continues to subside in the hours ahead.

Solar wind
speed: 331.5 km/sec
density: 6.5 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 0424 UT

X-ray Solar Flares
6-hr max: A8 1148 UT Sep16
24-hr: C2 0827 UT Sep18
explanation | more data
Updated: Today at: 0430 UT

Solar wind
speed: 312.8 km/sec
density: 6.5 protons/cm3
more data: ACE, DSCOVR
Updated: Today at 1724 UT

X-ray Solar Flares
6-hr max: C2 0122 UT Sep19
24-hr: C1 0115 UT Sep19
explanation | more data
Updated: Today at: 1730 UT